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51 results about "Conductance method" patented technology
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Method computes the maximum power point by comparison of the incremental conductance (I Δ / V Δ) to the array conductance (I / V). When these two are the same (I / V = I Δ / V Δ), the output voltage is the MPP voltage... The controller maintains this voltage until the irradiation changes and the process is repeated.
Compound vacuum gauge calibration system and method
The invention discloses a compound vacuum gauge calibration system and method, belonging to the technical field of measurement. The compound vacuum gauge calibration system disclosed by the invention comprises a mechanical pump, a molecular pump, a first vacuum valve, a second vacuum valve, a third vacuum valve, a fourth vacuum valve, a fifth vacuum valve, a sixth vacuum valve, a seventh vacuum valve, a vacuum gauge, a capacitance diaphragm gauge, a third vacuum gauge, a calibration chamber, a first small hole, a second small hole and an air source. The invention further discloses a compound vacuum gauge calibration method; a capacitance diaphragm gauge of which the full range is 1000 Torr is adopted as reference standard; the direct comparison method is adopted to realize the calibration within the range of 10<5> to 100 Pa; the expansion method is adopted to realize the calibration within the range of 100 to 10<-3> Pa; and the dynamic flow conductance method is adopted to realize the calibration within the range of 10<-4> to 10<-6> Pa. The compound vacuum gauge calibration system disclosed by the invention has the characteristics of low cost, small weight and size, portability, and the like.
Owner:卢耀文
Solar maximum power tracking method and solar charging device
InactiveCN102163067AGuaranteed accuracyGuaranteed working hoursBatteries circuit arrangementsElectric powerType conversionElectrical battery
The invention discloses a solar maximum power tracking method, which comprises the following steps of: firstly, carrying out global optimizing by using a larger-step-length disturbance method, finding a global maximum power point, tracking the maximum power point by using an incremental conductance method, and absorbing the advantages of the two methods to ensure the correctness of the current maximum power point; and secondly, locking the found maximum power point for eight to ten minutes, and searching the maximum power point for the second time after eight to ten minutes. The invention also discloses a charging device by using the solar maximum power tracking method. A control end of a buck type conversion module of the charging device is connected with a maximum power point tracking (MPPT) core control module; a signal input end of the buck type conversion module is connected with a solar battery; and a signal output end of the buck type conversion module is connected with a storage battery. By the invention, the charging efficiency of the solar battery on the storage battery is improved.
Owner:武汉万鹏科技有限公司
Detection of hydrogen sulfide gas using carbon nanotube-based chemical sensors
InactiveUS20130040397A1Improve portabilityHigh sensitivityMaterial thermal conductivityLayered products1-pyrenesulfonic acidNanowire
A method for preparing carbon allotrope based sulfide detectors comprising first functionalizing a carbon allotrope, such as a single-walled carbon nanotubes or graphene, with a solution of a polynuclear aromatic hydrocarbon-sulfonic acid, such as 1-pyrenesulfonic acid, followed by treatment with a metal, such as gold nanowires or cupric salt doped polyaniline, to give a metal-functionalized carbon allotrope, then drop casting the metal-functionalized carbon allotrope onto an inert surface, such as a silicon dioxide film on a silicon wafer having electrodes. Detection of sulfides may be by means such as photochemical or conductance methods. The hydrogen sulfide detectors may be used to detect and / or quantitate ppb and ppm levels of hydrogen sulfide in industrial settings or in detecting halitosis.
Owner:UNIVERSITY OF PITTSBURGH
Maximum power point tracking method under partial shade condition of photovoltaic system
InactiveCN102566646AAvoid falling intoAvoid local extremaPhotovoltaic energy generationElectric variable regulationEngineeringPeak value
The invention discloses a maximum power point tracking method under a partial shade condition of a photovoltaic system, and belongs to the technical field of a photovoltaic power generation system. The maximum power point tracking method comprises the following steps of: searching a point close to a peak value of the maximum power point by using voltage scanning; and finally determining the position of the maximum power point using a variable step incremental conductance method by taking a voltage value of the point as an initial value of the incremental conductance method. According to the method, the problem of reduced system efficiency caused by incapability of tracking the maximum power point in the case that a battery panel in the photovoltaic system is under a shade condition is solved. The method has the advantages of simple structure and capability of effectively avoiding local extremum produced when the photovoltaic system gets into local shade.
Owner:AUTOMATION RES & DESIGN INST OF METALLURGICAL IND
Measuring method of carbon, hydrogen and nitrogen contents in biomass fuel
InactiveCN103512858ALow priceReduce consumption costsMaterial analysis by optical meansHydrogenNitrogen
The invention discloses a measuring method of carbon, hydrogen and nitrogen contents in biomass fuel. The measuring method comprises the following steps of burning a sample to be measured, collecting mixed gas generated by burning, measuring and calculating full carbon, full hydrogen and full nitrogen percentage contents of the sample to be measured, and calculating the carbon, hydrogen and nitrogen contents in the biomass fuel to be measured. The method has the advantages that the measuring accuracy of the method is higher than that of an infrared-thermal conductance method of a coal sample, the measuring efficiency of the method is higher than the combined measuring efficiency of standard measuring methods, namely a semimicro Kelvin method and a three-section furnace method, and the method is applicable to quickly and efficiently measuring the carbon, hydrogen and nitrogen contents in the biomass fuel, can achieve high accuracy of measuring results and is low in implementation cost.
Owner:ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
Photovoltaic power generation system environment self-adaptive type MPPT (maximum power point tracking) method and system
ActiveCN104765400AAdjust duty cycle in real timeReal-time adjustment of duty cycle DElectric variable regulationLocal optimumMppt algorithm
The invention discloses a photovoltaic power generation system environment self-adaptive type MPPT (maximum power point tracking) method. A voltage correcting parameter delta U and PI are introduced to control a link, a duty ratio D of a direct-current chopper is regulated in real time, maximum power point voltage Um optimal-searching speed is increased, the power loss is reduced, and the maximum power point voltage Um is changed in real time along with the environmental conditions, the incremental conductance method (I&S) optimal-searching step length is reduced, and the photovoltaic battery MPPT is quickly and accurately realized, the defects that a conventional MPPT algorithm is easy to affect by the environment, the robustness is poor and the power loss is relatively large are improved, and the defects that the intelligent type MPPT algorithm is complex and easy to be locally optimal are also avoided.
Owner:WUHAN UNIV
System and method for detecting polymerase chain reaction (PCR) process through non-contact conductivity method in rear time
ActiveCN102604827AAvoid mutual contaminationImprove reusabilityBioreactor/fermenter combinationsBiological substance pretreatmentsEngineeringAlternating current
The invention relates to a system and a method for detecting a polymerase chain reaction (PCR) process through a non-contact conductivity method in rear time. The system is characterized by comprising an integrated PCR microchip based on micro-electromechanical system (MEMS) integration, an alternating-current excitation power supply, a current-to-voltage converting and amplifying circuit, a temperature sensing circuit, a heating circuit, a digital-analog / analog-digital conversion interface DAQ and an upper Labview control center, wherein the integrated PCR microchip integrates a micro reaction cavity, a temperature sensing electrode, a heating electrode and an electrochemical detection electrode; the micro reaction cavity is etched on the front surface of a silicon substrate; the heating electrode and the temperature sensing electrode are integrated on the back surface of the silicon substrate; the electrochemical detection electrode is an interdigital electrode, is bonded with the silicon substrate through an insulating layer and forms a sealed structure with the micro reaction cavity; and temperature circulation required by amplification is realized through the temperature sensing electrode and the heating electrode which are arranged on the back surface of the silicon substrate. The sensitivity and the resolution ratio of the system provided by the invention can reach fg / muL below, the reusability of the electrodes is high, the service life is long, and the reliability of the detecting result is high.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Device for measuring extremely-low gas flow based on static expansion vacuum standard
ActiveCN102052940AHigh measurement accuracyAvoid Measurement UncertaintyVolume/mass flow by differential pressureMeasurement deviceEngineering
The invention relates to a device for measuring an extremely-low gas flow based on the static expansion vacuum standard. The device comprises a backing pressure measurement system, a first valve, a gas pressure relief system, a second valve, a calibration chamber, a third valve, a small hole, a fourth valve, a fifth valve, a getter pump, a sixth valve, a molecular pump, a backing pump and an ionization gauge, wherein the backing pressure measurement system is connected with the gas pressure relief system through the first valve, the gas pressure relief system is connected with the calibration chamber through the second valve, the small hole is connected in parallel with the fourth valve to form a parallel structure and then one end of the parallel structure is connected with the calibration chamber through the third valve and the other end of the parallel structure is connected with a vacuum system, the getter pump is connected with the calibration chamber through the fifth valve, the backing pump is connected in series with the molecular pump and then connected with the calibration chamber through the sixth valve, and the ionization gauge is directly connected on the calibration chamber. The invention adopts the gas pressure generated by the static expansion vacuum standard to replace the introduced gas pressure of the gas flow meter in the constant conductance method, so as to further improve the gas flow measurement accuracy.
Owner:NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
Device and method for measuring pumping speed of micro vacuum pump through constant conductance method flow meter
The invention discloses a device and a method for measuring pumping speed of a micro vacuum pump through a constant conductance method flow meter. The device and the method can be used for realizing precise measurement on pumping speed of the micro vacuum pump. The constant conductance method flow meter can be used to generate micro flow, and also stable gas flow can be provided for a long time, so that the needed micro stable gas flow problem in measurement of the pumping speed of the micro vacuum pump is solved; and meanwhile, a general method for measuring an up-down symmetrical structure of a test cover for ultrahigh vacuum pump pumping speed test is avoided, the inner surface area of the test cover is reduced, gas release influence quantity of the surface area of the test cover is reduced, test accuracy is improved, and accurate measurement for pumping speed of the micro vacuum pump is realized.
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
Device and method for online measurement of residence time distribution of rotating packed bed
InactiveCN101793854AGuaranteed online outputGuaranteed safe placementMaterial resistanceFluorescenceData acquisition
The invention relates to a device and a method for the online measurement of the residence time distribution of a rotating packed bed, belonging to the technical field of the online determination of the residence time distribution. The device comprises an electrode and an internal pipe, wherein the electrode is installed on the internal side and the external side of the non-conductive packing of the rotating packed bed, and the internal pipe is filled with tracer liquid. The electrode is connected with a slip ring through a conducting wire. The slip ring and a rotating shaft rotate synchronously and the slip ring is connected with a data acquisition system. The method is that gas and liquid with fixed flow are injected into the liquid distributor of the rotating packed bed, the tracer liquid is filled, the slip ring transmits electrical signals to the outside, electric signal data is acquired and residence time distribution function E (t) is obtained by adopting data integral calculation. The invention realizes the online measurement of the residence time distribution and has the advantages of that the real-time performance is high, the continuity is good, the detailed features ofliquid holdup can be comprehensively reflected and the like; and by adopting the conductance method, not only the error caused by the x-ray method, the ultrasonic method, the conductivity method andthe fluorescence method is overcome, but also the online measurement can facilitate the detection of the impacts of all kinds of impact factors of the residence time distribution on the liquid holdup.
Owner:ZHONGBEI UNIV
Bezier-based polynomial photovoltaic array maximum power tracking method
ActiveCN108733126AMaximum power tracking worksEasy to implementPhotovoltaic energy generationElectric variable regulationWork outputVoltage
The invention discloses a Bezier-based polynomial photovoltaic array maximum power tracking method. The method includes: during the process of measuring actual irradiance and temperature value of a photovoltaic array, calculating maximum power point parameter of a photovoltaic array, acquiring an output characteristic curve of the same, and performing polynomial fitting to obtain a fitting result;according to an incremental conductance method and voltage and current measured in real time, slightly adjusting a maximum power point acquired through theoretical calculation, and taking a voltage value acquired by detection as an independent variable to enable working output characteristics of a photovoltaic module to be at maximum power point voltage after slight adjusting and to enable the photovoltaic module to work at maximum output power to realize maximum power tracking of the photovoltaic array. The method can realize effective maximum power tracking and has the advantages of being simple to realize and high in tracking accuracy.
Owner:HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
Tracking method for maximum power point (MPP) of tandem photovoltaic modules
ActiveCN105630061AReduce shockReduce lossPhotovoltaic energy generationElectric variable regulationEngineeringMaximum power principle
The invention discloses a tracking method for a maximum power point (MPP) of tandem photovoltaic modules. The tracking method comprises the following steps of globally scanning by taking open-circuit voltage as starting voltage; dividing a multi-peak P-U curve into single-peak P-U intervals according to output voltage of the tandem photovoltaic modules when bypass diodes are conducted; taking the P-U curve as a single-peak interval when no bypass diodes are conducted; introducing a formula delta U(n)=N*ln-dI(n+1) / dU(n+1) / [I(n+1) / U(n+1)] in absolute terms, calculating at 0.4 to 0.8 time of P-U intervals of all the single peaks to obtain a voltage value U0 when a linear equation value of delta U (n) about the output voltage U of the tandem photovoltaic modules is 0, and adopting an incremental conductance method to track the MPP by taking the U0 as starting voltage and the delta U (n) as a step length voltage value; comparing to obtain global MPP and working voltage. According to the tracking method disclosed by the invention, the quickness and the accuracy of tracking the MPP by the tandem photovoltaic modules can be guaranteed, and the effect of reducing power oscillation and loss of a circuit can be guaranteed.
Owner:浙江裕禾检测有限公司
Ammonia nitrogen on-line monitoring instrument
InactiveCN103245697AEasy to operateReduce experiment costPreparing sample for investigationMaterial impedancePeristaltic pumpDistillation
The invention discloses an ammonia nitrogen on-line monitoring instrument. The ammonia nitrogen on-line monitoring instrument consists of a sample feeding tube, a sample feeding peristaltic pump, a distillation heating bottle, an alkali liquid sample feeding peristaltic pump, a cleaning peristaltic pump, an air pump, a cooling tube, an absorption bottle, a boric acid absorption liquid sample feeding peristaltic pump and a communication pipeline. According to the ammonia nitrogen on-line monitoring instrument, a conduction measuring method for testing ammonia nitrogen, namely a wet process distillation-conductance method, is established. Comparing an analysis result of standard samples, various kinds of surface water and wastewater with a synchronously-adopted national standard analysis result, various technical requirements of monitoring technology standard are met, so that the instrument is easy to operate, time-saving, labor-saving, efficient and correct; the experiment cost is also reduced; and the instrument is suitable for popularization and application of ammonia nitrogen during on-line monitoring.
Owner:泰州市华晨仪器有限公司
Device and method for measuring pumping speed and outgasing rate of ionization gauge
ActiveCN101710014AWide measurement rangeReduce measurement uncertaintyFluid pressure measurementMeasurement deviceEngineering
Owner:NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
An improved incremental admittance method for maximum power point tracking of solar cells
InactiveCN102289240AIgnore series resistancePhotovoltaicsPhotovoltaic energy generationSolar cellDependability
The invention discloses an improved incremental conductance method for realizing maximum power point tracking of a solar cell. In the improved incremental conductance method, an operation work zone of the solar cell is judged according to the acquired output voltage and power of the solar cell, and different control modifying instructions are adopted according to different work zones so as to realize the maximum power point tracking of the solar cell. The improved incremental conductance method is characterized in that output voltage and current sampling of a disposal solar cell are increasedin an original MPPT (Maximum Power Point Tracking) scanning period, current variation caused by illumination change is eliminated by using an algorithm, thus the direction misjudgment generated by the incremental conductance method due to sharp change of the illumination intensity is avoided, and further the reliability of a maximum power point tracking system of the solar cell is improved.
Owner:36TH RES INST OF CETC
Method for calculating and eliminating high-voltage insulation resistance measurement sampling circuit errors
InactiveCN109470923AReduced voltage level requirementsHigh measurement accuracyVery high resistance measurementsHigh pressureGrounding resistance
The invention discloses a method for calculating and eliminating high-voltage insulation resistance measurement sampling circuit errors. The method comprises the steps that S2, two grounded divider resistors RT with the same resistance are set inside an insulation monitor mainframe; S4, bus grounded voltage VH and VL is obtained through the ground divider resistors, and the two ground divider resistors are represented through RH and RL; S6, when RH=RL=infinity, VH=VL=2,000 V; S8, when the system single-end ground or insulation resistance is lowered, an equation specified in the description isobtained. Due to the equation, the single-end ground resistance RH1 or RL1 can be obtained. For solving the problem that an existing detection technology error is large, a software algorithm based onthe electric conduction method is put forwards, the algorithm is simplified, the influence of the sampling resistor Rt for the measuring precision is considered, and the measuring precision is improved. The system insulation drop caused by positive and negative electrode ground voltage is prevented from being directly measured, and the requirement for the voltage sensor voltage level is lowered.
Owner:中国船舶重工集团公司第七〇三研究所无锡分部
Double-sided printed circuit board (PCB) with elements and mutual conductance method thereof
ActiveCN102065645AEmission reductionReduce consumptionPrinted circuit assemblingPoint-like light sourceCopper platingEngineering
The invention discloses a double-sided printed circuit board (PCB) with elements and a mutual conductance method thereof, and provides a method for realizing mutual conductance by elements used in a double-sided PCB. The method comprises the following steps: providing the double-sided PCB with holes, wherein, the PCB comprises a top circuit layer, a bottom circuit layer and an insulating film layer bonded between the top circuit layer and the bottom circuit layer, and the holes pass through the top circuit layer and the insulating film layer besides the bottom circuit layer; optionally forming the bottom circuit layer at the holes to be aligned with or approximately aligned with the top circuit layer; and welding one part of the elements on the top circuit layer, and welding the other part of the elements on the bottom circuit layer at the holes so as to realize mutual conductance of the two circuit layers. The mutual conductance method is simple and low in cost; and double-sided circuits are conducted without eletcroless copper plating during the manufacturing process, thus being very environmental-friendly. The invention further discloses the PCB with the elements manufactured by the method.
Owner:王定锋
Method for detecting contents of carcinonitrile, quaternary ammonium salt and ammonium, potassium and calcium impurity ions thereof by adopting cation exchange suppressed conductance method
The invention discloses a method for detecting the contents of carcinonitrile, quaternary ammonium salt and ammonium, potassium and calcium impurity ions thereof by adopting a cation exchange suppressed conductance method. The quaternary ammonium salt is N-(3-chloro-2-hydroxypropyl)-N,N,N-trimethylammonium chloride; the sample injection volume of a sample is 25[mu]L; after sample injection thereof, the sample is brought by an eluent into an IonPac CS 17 (4mm*50mm) guard column and an IonPac CS 17 (4mm*250mm) analytical column which are connected to an ion chromatograph for separation; 2mmol / Lof methanesulfonic acid is used as the eluent; at a flow rate of 1.0mL / min, conductance detection shows that the separation degrees of the carcinonitrile, 3-chloro-2-hydroxypropyltrimethylammonium chloride, NH4<+>, K<+> and Na<+> are greater than 1.5. By the method, the overall stability and the reproducibility are ideal and determination data are accurate and reliable; the method can be widely applied to food production, biomedicines and other industries.
Owner:ZHEJIANG SHUREN UNIV
Online detection for trace moisture of anhydrous hydrogen fluoride
InactiveCN105784782AEasy to detect onlineReliable online detectionMaterial resistancePlatinumHydrogen fluoride
The invention relates to the online detection for trace moisture of anhydrous hydrogen fluoride. A flowing conductive battery used for detecting trace moisture according to a conductive method is composed of a stainless steel shell with an interlayer, a polytetrafluoroethylene liner, a platinum electrode, a seal ring and a valve; the flowing conductive battery is in parallel connection with an anhydrous hydrogen fluoride dewatering production line in a form of bypass; the temperature of the flowing conductive battery is controlled to be 0 DEG C; in a detection process, a tee joint is turned to the bypass and a conductivity meter is used for recording and calculating test data; the flowing conductive battery has the characteristics of capability of realizing the online detection for trace moisture of anhydrous hydrogen fluoride, safety, accuracy and reliability.
Owner:广东金光高科股份有限公司
Method and device for online measurement of liquid holdup of rotating packed bed
InactiveCN101793853AGuaranteed online outputOnline output assuranceMaterial resistanceElectricityElectrical resistance and conductance
The invention relates to a method and a device for the online measurement of the liquid holdup of a rotating packed bed, belonging to the technical field of the online measurement of the liquid holdup. The invention solves the problem that the existing liquid holdup measurement method is not suitable for the measurement of the liquid holdup of the rotating packed bed. The device comprises an electrode, wherein the electrode is arranged on the non-conductive packing of the rotating packed bed. The electrode is connected with a slip ring through a conducting wire. The slip ring and a rotating shaft rotate synchronously. The slip ring is connected with a data acquisition system. The steps of the method comprise that gas and liquid with fixed flow are injected into the rotating packed bed, the slip ring transmits electrical signals to the outside, the electric signal data is acquired and solution volume corresponding to the resistance of standard solution is compared. The invention realizes the online measurement of the liquid holdup and has the advantages of that the real-time performance is high, the continuity is good, the detailed features of the liquid holdup can be comprehensively reflected and the like; the method and the device can be directly used for the measurement of local liquid holdup; and by adopting the conductance method, not only the error caused by the weight method and the volumetric method is overcome, but also the online measurement can facilitate the detection of the impacts of all kinds of impact factors of the liquid holdup on the liquid holdup.
Owner:ZHONGBEI UNIV
Static expansion method vacuum standard based method for measuring minimum gas flow
ActiveCN101995275BHigh measurement accuracyAvoid Measurement UncertaintyVolume/mass flow by differential pressureCapacitanceEngineering
Owner:NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
Variable step size photovoltaic MPPT optimization control method based on incremental conductance method
InactiveCN113036803AImprove stabilityQuick responseSingle network parallel feeding arrangementsPhotovoltaic energy generationThermodynamicsPhotovoltaic arrays
The invention relates to a variable-step photovoltaic MPPT optimization control method based on an incremental conductance method. According to the algorithm, the maximum power point of the photovoltaic array is tracked by automatically adjusting the step length through the distance to the MPP, the MPP can be quickly approached by using a large step size when being away from the MPP, and the step size is reduced when the MPP is approached so as to reduce jitter and improve precision until the photovoltaic cell finally runs at the maximum power point. When external illumination and temperature conditions change, the system can effectively track the global maximum power of the photovoltaic module due to the existence of the variable step size algorithm. According to the method, the stability of maximum power point tracking of the photovoltaic system is guaranteed, under the condition that current and voltage output changes are caused by sudden change of illumination and temperature, the tracking stability can still be improved under the condition that the speed is guaranteed, the phenomenon of misjudgment and misreading of maximum power tracking is avoided, and then long-term stable power output of the photovoltaic system is guaranteed.
Owner:HARBIN UNIV OF SCI & TECH
Method of improving detecting sensitivity of micro-fluidic chip by non-contact conducting method
The invention provides a method of improving detecting sensitivity of a micro-fluidic chip by a non-contact conducting method. The method comprises the following steps: taking the micro-fluidic chip and adding a buffer solution, wherein a sample pond, a sample waste liquor pond, a buffer solution storage pond, a buffer solution waste liquor pond, a feeding channel and a separating channel of the micro-fluidic chip are filled with the buffer solution; absorbing the buffer solution in the sample pond and the buffer solution storage pond; adding a to-be-tested sample solution prepared by the buffer solution into the sample pond and adding the buffer solution containing ethanol into the buffer solution storage pond, wherein the volume content of ethanol is greater than 10%; inserting an electrode, feeding the sample by taking the sample pond as an anode and the sample waste liquor pond as a cathode, and separating the sample by taking the buffer solution storage pond as an anode and the buffer solution waste liquor pond as a cathode after sample feeding; and repeating sample feeding and separating for at least one time after sample feeding and separating. By adopting the detection method, the detection limit can be lower to 10 pg / ml. The method is very high in sensitivity, and can achieve micro-fluidic chip well. In addition, the method is simple to operate, low in cost and high inpracticality.
Owner:ZHUJIANG HOSPITAL SOUTHERN MEDICAL UNIV
Traditional Chinese medicine health state conductance main and collateral channel identification method and system
InactiveCN109316187AImprove scienceImprove normativeDiagnostic signal processingSensorsMedicineComputer equipment
Owner:GUANGDONG HOSPITAL OF TRADITIONAL CHINESE MEDICINE
Sinusoidal disturbance photovoltaic MPPT nonlinear control method
InactiveCN104571257AAddress sensitive issuesAvoid power fluctuationsPhotovoltaic energy generationElectric variable regulationCapacitanceSystem stability
The invention discloses a sinusoidal disturbance photovoltaic MPPT nonlinear control method in the field of solar power generation. For the characteristic that the requirement of the incremental conductivity method for the parameter accuracy is high, the method for setting the current sine disturbance and extracting the disturbance value through the DFT is provided by researching the front capacitor dynamic process in the MPPT on the basis of the increment conductivity method and designing an MPPT nonlinear controller through the back stepping method. The incremental electric conductivity calculation accuracy and speed are increased, the system stability is ensured through the design of the nonlinear controller, the MPPT and current integrated control is achieved, the complex logic control in the conventional control is avoided, and the method can be used in solar power generation.
Owner:YANGZHOU UNIV
Supersensitivity leakage detecting device with lower limit being 10<-16> Pam<3>/s and method
InactiveCN109323817ALower background pressureIncrease sub pressureDetection of fluid at leakage pointLower limitEngineering
The invention relates to a supersensitivity leakage detecting device with the lower limit being 10<-16> Pam<3> / s and a method. The supersensitivity leakage detecting device comprises a dry pump (RP1),a molecular pump (TMP1), a getter pump (NEG1), a vacuum gauge (G1), a four-stage mass spectrometer (QMS), a first vacuum valve, a second vacuum valve, a third vacuum valve, a fourth vacuum valve, a fifth vacuum valve, a detecting chamber (VC1), a constant conductance method flowmeter (FM), a gas source and a vacuum pipeline. According to the supersensitivity leakage detecting device, on the basisof a cumulative comparison method, the standard gas flow with the lower limit being 1.3*10<-16> Pam<3> / s is provided by the constant conductance method flowmeter, and thus the leakage detecting lowerlimit of the leakage detecting device is extended to 10<-16> Pam<3> / s.
Owner:BEIJING DONGFANG MEASUREMENT & TEST INST
A Multi-Peak MPPT Method for Photovoltaic Inverters Based on Improved Conductance Incremental Method
ActiveCN107168447BEfficient startImprove power generation efficiencyPhotovoltaic energy generationElectric variable regulationEngineeringPeak value
The invention discloses an improved conductance increment method based photovoltaic inverter multiple peak value MPPT (Maximum Power Point Tracking). Photovoltaic array information is used as an inverter control parameter, real-time monitoring of a shadow is achieved, and shadow change can be accurately and effectively determined; a segment fixed step size conductance increment method is used as a global maximum power point scanning algorithm to perform maximum power primary scanning, and the segment fixed step size conductance increment method is used to perform accurate tracking on a global maximum power after primary scanning is completed. The method has high power fluctuation sensitivity, can eliminate sun irradiation fluctuation without in the absence of a shadow, can avoid triggering of power fluctuation for the global maximum power point scanning algorithm in the absence of a shadow, can improve the scanning efficiency, can rapidly, stably and accurately achieve MPPT of a shadow, and can improve the MPPT efficiency in the presence of a shadow.
Owner:GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
Method for fuzzy control over MPPT through single-stage photovoltaic Z source inverter
ActiveCN105739594AFast trackCompact structurePhotovoltaic energy generationElectric variable regulationZ-source inverterSingle stage
The invention discloses a method for fuzzy control over MPPT through a single-stage photovoltaic Z source inverter. Based on a single-stage photovoltaic system of the Z source inverter, the voltage is increased according to the shoot-through time of a Z source network and the inverter, meanwhile, a fuzzy controller with an asymmetric fuzzy membership is adopted for adaptively adjusting the step obtained through a traditional incremental conductance method, and then rapidity and stability of controller tracking are achieved. The system is compact in overall structure and higher in efficiency.
Owner:STATE GRID CORP OF CHINA +4
Conductivity method-based moisture content measurement method of crude oil
InactiveCN109540975AAvoid the problem that the measurement accuracy cannot be guaranteedImprove efficiencyMaterial resistanceMoisturePhysics
The invention discloses a conductivity method-based moisture content measurement method of crude oil. The conductivity method-based moisture content measurement method comprises the steps of (1) placing a gravity sensor, a temperature sensor and a heating device in a constant-current source-based electrode conductivity device; (2) placing a sample in the electrode conductivity device in the step (1), measuring a temperature, and measuring a voltage of the electrode conductivity device and total mass of the sample; (3) heating the sample according to the step (2), controlling the sample to a designed temperature, and measuring the voltage of the electrode conductivity device and the total mass of the sample; and (4) calculating moisture content of the sample according to the voltages and the mass which are measured in the steps (2) and (3), crude oil fraction vaporization rate corresponding to temperatures in measurement for two times, a current of the constant-current source used by the electrode conductivity vice, an electrode constant of the electrode and a relation between the conductivity and salt content.
Owner:HARBIN UNIV OF SCI & TECH
A method for maximum power point tracking of photovoltaic modules connected in series
ActiveCN105630061BReduce shockReduce lossPhotovoltaic energy generationElectric variable regulationEngineeringOpen-circuit voltage
The invention discloses a tracking method for a maximum power point (MPP) of tandem photovoltaic modules. The tracking method comprises the following steps of globally scanning by taking open-circuit voltage as starting voltage; dividing a multi-peak P-U curve into single-peak P-U intervals according to output voltage of the tandem photovoltaic modules when bypass diodes are conducted; taking the P-U curve as a single-peak interval when no bypass diodes are conducted; introducing a formula delta U(n)=N*ln-dI(n+1) / dU(n+1) / [I(n+1) / U(n+1)] in absolute terms, calculating at 0.4 to 0.8 time of P-U intervals of all the single peaks to obtain a voltage value U0 when a linear equation value of delta U (n) about the output voltage U of the tandem photovoltaic modules is 0, and adopting an incremental conductance method to track the MPP by taking the U0 as starting voltage and the delta U (n) as a step length voltage value; comparing to obtain global MPP and working voltage. According to the tracking method disclosed by the invention, the quickness and the accuracy of tracking the MPP by the tandem photovoltaic modules can be guaranteed, and the effect of reducing power oscillation and loss of a circuit can be guaranteed.
Owner:浙江裕禾检测有限公司
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